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/*-
* Copyright (c) 2008-2012 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* __wt_eviction_check --
* Wake the eviction server if necessary.
*/
static inline void
__wt_eviction_check(WT_SESSION_IMPL *session, int *read_lockoutp)
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
uint64_t bytes_inuse, bytes_max;
conn = S2C(session);
cache = conn->cache;
/*
* If we're over the maximum cache, shut out reads (which
* include page allocations) until we evict to back under the
* maximum cache. Eviction will keep pushing out pages so we
* don't run on the edge all the time.
*/
bytes_inuse = __wt_cache_bytes_inuse(cache);
bytes_max = conn->cache_size;
if (read_lockoutp != NULL)
*read_lockoutp = (bytes_inuse > bytes_max);
/* Wake eviction when we're over the trigger cache size. */
if (bytes_inuse > cache->eviction_trigger * (bytes_max / 100))
__wt_evict_server_wake(session);
}
/*
* __wt_eviction_page_check --
* Check if a page is too big and wake the eviction server if necessary.
*/
static inline int
__wt_eviction_page_check(WT_SESSION_IMPL *session, WT_PAGE *page)
{
WT_CONNECTION_IMPL *conn;
conn = S2C(session);
/*
* If the page is pathologically large, force eviction.
* Otherwise, if the cache is more than 95% full, wake up the eviction
* thread.
*/
if (page != NULL &&
!F_ISSET(page, WT_PAGE_FORCE_EVICT | WT_PAGE_PINNED) &&
(((int64_t)page->memory_footprint > conn->cache_size / 2) ||
(page->memory_footprint > 20 * session->btree->maxleafpage))) {
/*
* We're already inside a serialized function, so we need to
* take some care.
*/
WT_RET(__wt_evict_page_request(session, page));
} else
__wt_eviction_check(session, NULL);
return (0);
}
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